A centralized management device includes an information collection unit that collects interference power level information including received power levels from neighboring access points causing interference to the access points, a received power level from each station being a destination of the access points, and transmission power level information including a transmission power level of the access points, and a control value decision unit that decides an interference detection threshold and a transmission power level in the access points according to an acquisition frequency of transmission opportunity and an estimated value of throughput that are computed, from the collected information, based on an interference relationship and notifies the decided interference detection threshold and the transmission power level as control values to the access points; and the access points performs control of the interference detection threshold and the transmission power level based on the control values notified from the centralized management device.